The present invention provides an omnidirectional indoor antenna for 5G communication, including a horizontal polarization unit, a vertical polarization unit, a dielectric board, and a feed network; the horizontal polarization unit is located on the dielectric board, and the dielectric board is circular The horizontal polarization unit is uniformly set outward with the center of the dielectric plate as the center of the circle, and the vertical polarization unit is located at the center of the horizontal polarization unit and is perpendicular to the horizontal polarization unit, that is, perpendicular to the dielectric plate; the horizontal polarization unit includes SMA feed Electric head, one-to-eight feed network, eight pairs of radiating dipoles, FR4 dielectric board, "sun"-shaped ground plane, eight pairs of parasitic patches, eight pairs of guide units; the vertical polarization unit includes SMA feed head, "Sun" shaped ground plane, "vase" shaped vertically polarized radiation structure. The antenna has low profile, wide impedance bandwidth, high isolation, high gain, low out-of-roundness, and low cross-polarization characteristics.